Growth and photosynthetic efficiency promotion of sugar beet (<Emphasis Type="Italic">Beta vulgaris</Emphasis> L.) by endophytic bacteria |
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Authors: | Yingwu Shi Kai Lou Chun Li |
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Institution: | (1) Institute of Microbiology, Xinjiang Academy of Agriculture Science, Urumqi, Xinjiang, China;(2) Key Laboratory of Green Processes of Chemical Engineering of Xinjiang Production and Construction Corps, College of Agronomy, Shihezi University, Xinjiang, China;(3) Department of Biotechnology, School of Life Science and Technology, Beijing Institute of Technology, Beijing, China |
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Abstract: | Very little is known about the physiological interactions between plants and endophytic bacteria. We investigated the impact
of three endophytic bacteria, Bacillus pumilus 2-1, Chryseobacterium indologene 2-2, and Acinetobacter johnsonii 3-1, on the photosynthetic capacity and growth of sugar beet. Endophyte-free plants were obtained first and infected with
the bacteria. Measurements of total chlorophyll content revealed very significant differences between endophyte-free beet
plants and some infected by endophytic bacteria. The maximum photochemical yield (Fv/Fm) was used to determine any photosynthetic effect on plants caused by biotic or abiotic factors. After 30 days of growth,
there was significantly higher Fv/Fm for endophyte-infected than endophyte-free plants. The light response curves of beet showed that photosynthetic capacity
was significantly increased in endophyte-infected plants. Photosynthesis of endophyte-free plants was saturated at 1,300 μmol m−2 s−1, whereas endophyte-infected plants were not saturated at the irradiance used. The effect seemed to be due to promotion of
electron transport in the thylakoid membranes. Promotion of photosynthetic capacity in sugar beet was due to increased chlorophyll
content, leading to a consequent increased carbohydrate synthesis. It is possible that the increased maximum yield of photosynthesis
in sugar beet was promoted by phytohormones and produced by the bacteria. |
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